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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237f3a6d6a0548fb7f65b221ca8cd8b2a449bebb4fad663bbd4f4dea83d749d9' 
  AND token = 'L+BjNTs2sCyxwi/EpasRC28Ughf7YeaO/xUxMTdLnYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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