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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd76e42773e5dcc81e60fceb73ce3b638e50f7174211a62d5aabd3792b9034b5' 
  AND token = 'C2SznPGJpZwlY/y5Dbhj6sjrgOF17sdAcyp4NcxgIQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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