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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7133cf1df71cf7da4becb994d783822b692f758daeca200b8872c57bcf0f917f' 
  AND token = 'XpO4C/X4U+CUiUpkgLAPxit7oXc07/2XcQLBLH86Nbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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