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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68415cdfce34564d4a50ade9b427c3c4fb86dbdcaae6cb1d258a739b49b8b967' 
  AND token = '9a+LBkqPl+ov4LxZ0SWOSCF213GKXIRjCEvCcvNFzuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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