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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7388fe4482ec4bc42ee4ba14739838a40e931bcd0bdf407f5413d21912846fd' 
  AND token = 'RLJuxS3utmOP6ICVtu0q40IOBioIhbK+GpCxaSFrN6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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