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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89ad087d22988892fd2d1253c0db227e9ed2a1d636fd515b14ad6688e048664' 
  AND token = 'Y9dEO+0O7nOjPStnGxZiW4hat0/B3JG7ZTLD9rOmL2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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