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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf81032368cc3d305906e812976e6aa8d1bca00123a696b0c1d8587088a2531f' 
  AND token = '7AYgJvC46q0kP9c2W0AJvcKwVG4mD+az3+1cPoF9TuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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