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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abd9593d05d0ed700dfa53831e1a02c76c1a338c0402cbe6395434f5e463f46' 
  AND token = '+9K7rzccsh0eNID6nVy+rxPp3OsjHGMrMzl+OePTqxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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