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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d7f5cd0e87a7dc3a18df4b6c6be4ba90e1773428a1c52b9b8eecdbdf76a623' 
  AND token = 'nmd8i0Jnj/q9mw2YDEZiHqkuD/3E24XU1oJbJedvJiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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