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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468a81804443253e5923f2429b84f5210fece6bd4181c051e50158e6820a19e2' 
  AND token = 'ePa/iTTU5BN4k1NAwjHTRhKW6jdIuffNtld/b4ZGEX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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