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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7547fc6c709c4b95f3978d8a6751007681f2b2d9c5dc959358162af0ba8996' 
  AND token = 'b+s5rjmsJkQ+eObfcHJdSlTVjOgakryPSqEHbOsi4go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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