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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25030c4aadf80fc40a1197708888de87e8fc65e61f5eef26ccb9d1e72d6877ce' 
  AND token = 'LXNMjDBrbwcKjovq6aymKNVqwXK3DQoaafqB2gTYnc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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