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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2471ef6925048e45ee2f6b8102897a8450028b87d34e85b3a141c9bf93966743' 
  AND token = '0UvE8Ob3AHRTcopTS1ddIn3oZ2FKlf1ARn82h1OqJlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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