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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b871aec9d28808ea902bfcd457942b38570788c56dcd534b21be6e81808c375' 
  AND token = 'oGauMp8XV1V5mMMGpP3HEr44FmTo46bB/VNk3OzVBhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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