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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef569d495b1b40d9f4ab175286805818eb8deb58561d6c0b9452f2f7d0f2b26e' 
  AND token = 'URkZMiUojqYLROXsWdfSUJDIA2lBDcjQ8VuMHSKCaTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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