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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9effa2ac14236c25c9f6544376adb34e647a2560907e8677216fc20281c1628' 
  AND token = 'T8M36/S0s0cdzKnFcmKKnMz+5/V46szaGU7zIS/5oVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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