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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8350e26add0fc62d4562e7d7b3cbe96562d852364d7577a0d9208d19ca867068' 
  AND token = 'z1Acrk09TbVkv1d5HW8bM7lUz65ZU8a+vN85c6JDrmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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