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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f5e92930a32164423aa781848f1dd7adfdaa0c1a567f2dd4e3c1d5d5196c745' 
  AND token = 'MGrHwAuKJxf68y45yQPi7Td9FhWRfU9vsZwARhzkVgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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