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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a33a872b0dd658bf0675e03a51a10ad33638a1fec67e6750afd6abe4493c3d4' 
  AND token = '5s741kO2TL6MDxyABSKPqJW6fb90Dd/YlC/5OkjCLj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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