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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0baa2223ee304529cd4c080ea7b550df7ae07b40758e1fefb2d080f53c98b51e' 
  AND token = 'mbec51cupxzFj/mUSzEDrCUpN/SUilFadiLwHhDAmrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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