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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1c183e573f68085ccd723ca7fb2aeadeed9db5e6c77f3dffce3d109779a151' 
  AND token = 'BwCZ9yglQ3KUjRBjAqe1DtsY8xW9h13I/Pzk20fHO94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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