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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7ccadb930b9600e3feaa45850a35f968a08e2f2304b5e963f27f2746c0624e' 
  AND token = 'y6bBlbSC7WBHrRZGbIxDLaiDJEzc3OveRYCsAFOYthU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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