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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2d765738ef8b9e1c23fc1a60af407b0282ff17d8bf74b20ab4095a7ed68bf2' 
  AND token = 'Q9/QCTecj3VXSjtnwtJBIy0PD4ahZXRpDi/VEMRSpLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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