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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a974f2cf082c03ae371c6cd782684838c09e208110f401473496d4d4f7482a6' 
  AND token = 'zGxEYLA0ha2yIcIN88pFYOxTQqnz/aXjD14WslukT34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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