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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '366aa79ecfbc290f20c8a12e639ecf94358320b67ac7b555ec08714d0cada926' 
  AND token = 'IuU/1Csp4hIbxG5F2wieJ5Nc/GhKMn1i6QUi4plKgAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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