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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ac6be1d96943ca481339ee920ce005d63e7fe71101240ade63aeb6e3736521' 
  AND token = 'mKcml/3+65U9af34iAD/ef2n7tiluIg6g0mnnhOJMv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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