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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7047e877bc5eaa18fcc825b6ae64b7f6277d10ae46715bdaf25d03a958fbf1' 
  AND token = 'VF/Er8byUobR6WGfnCBXsNzHQvx7A3Gq9DeRudnjIbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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