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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36340c3da2268815070d0030583da6f7a0d490ed367a64dc1751c1332584e168' 
  AND token = 'bDJWXfd29UOROb1Rq0g54Nj1+4XK894Q1UY3i5rM91s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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