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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17b5813aa8c5ff8d283b7f233d55e6f51dc6aebeae6eaf49a49fcc3ce678b3a' 
  AND token = 'v27BrbggsJEn3FIzIG8Rcga7N9IGLMgi1l5VXOeq1Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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