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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e6a748465aa00e582575a18f6b30cc294e7c8a6a86b6ace892a6da21a7febb' 
  AND token = '5OvbsOXZVYa9V7Q3bUSIJdDUBXSLmzfTQ1fBFRNcD7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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