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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9d1cc0558410fe0538787a2253a732b47f0584d727ae01e053d607bd3fa5af' 
  AND token = 'pKGXoqiUZt+eWB1sXUr3dMjGN3xVmPmE/s20/laMxcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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