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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902046edcb14a4cb602c23967207a231e96e65ac06c49873478665e4d85d3cac' 
  AND token = 'Is4iF93gr1z//GidZAroDSEzot5LX6aK+Xnqy9tXJsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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