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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973ea2781ced70bfbd0507c46c94c22d6c4d89bfd84b59d4fa9f61c4ec2357a4' 
  AND token = 'lfs88aoX3YTF7D7lCAyrZF+BxjF1n3oTcMOJXeTB9mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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