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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3dedbe1f238c356d85863bf73c2444ffafe62210f773136cd4de069f39f3be' 
  AND token = '1biDZNVwXuYzjK6E4VIZ7EdMyRo0aXk3lqIQ8tKXU90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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