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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b338f24791c5026039f3ec5492accb0a626b9706c791d99b0e4a474496a54c' 
  AND token = 'WoQUxP94t1KmF6rW+eeXjPd+hOMUsTiN21z+RAtOtrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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