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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b69108df92bbad14b1eaa93849681d03767bb4c67f75e699305cc6ff353323c' 
  AND token = 'lcepkYuIZXjx7WWdEjlKN1T4UO0QzJzn7FmrrcWL0lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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