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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b7c37652c32970a79fbf884fb34d993be569e734b88faacd1fa404646e5ca1' 
  AND token = 'Y2e1Il2eOkE+MIx9V3ECKMhER5F/57bn3co+fMGw/kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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