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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7afcfad59bc9eba8916b7e7c94e75bff5d74ae64feacd7be9eb4bf66a6e61ec3' 
  AND token = 'x5Mt2HpQCquz2md+ps0+YjBaiR4S/jCMhm6PedV4Vkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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