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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1fdedd760bbcd9ae328c57ec28150cd5a4bacaf2037203e92ffdec78f65be7' 
  AND token = '9Udtzs2krNKqTEZYAOiR/aM8bjU4Pm4/zhkXeI15LpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}