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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5faf4eba9d1ddf8bdb2f6807e0beb6ddf6f8efc7f0cb99be8efb7d58c0932d06' 
  AND token = 'R6eCT0HSd2wloRSEWYlanumc2c4Zg/ahXolWFC/QBBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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