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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97cf585ab9477ac14804191af9a7349c34c96a7b6ea2ea9061d96d19eecb4436' 
  AND token = '2iUY9x2bO0EG4165EQ899y1Ln8KpkKTTOKeOQys0WCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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