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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b90395f4f612e1e0e1b82f7a207fef3d98b08680c0ca61584ad122fd75174c' 
  AND token = 'BSBwDbUAqJKR18PWebNlXIGUEqHyyvq89HxOd2xx/10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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