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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b58bfeff89ed2e5cfb86ae9fec70a17d7566bd414fc0953b0d32922dada12f' 
  AND token = 'GqTfj0mZxqQnEPw470ECuJsZ2VwjMWJtL0mI+j4JpLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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