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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2da40a92dc8d6f7bb0d3b8edc4ba4a4e80a1e1b3dddf07caedc9e7988ccd8a' 
  AND token = 'HzryP2WAXH4mn5TmsRH2/XVtqjePvdN0dFA1XR6Ez2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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