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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cae12d742b7525e999274906f26c8a238dd1c66374f8b32c5a3cd6b386e3214' 
  AND token = 'LcFUBFon8HjyM7jCDrxvme5C2xGOEhmI1Lp62hf6jzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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