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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847983982d6c8ba561a0c1a4c0c35cb61c35d9cc23765a3fd0dd5eccb6df9d57' 
  AND token = 'bfhBGXd4fnbnNayXtxrQWFTMj8r8Ym1Lcn7mRl/P8i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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