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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d899115da5415242bf247c5bb96f91b33982fee1383f5b1f18a03dce72ae987' 
  AND token = 'Z3oNfKsaTKLBh63BfhMmZ4azwD84C1+MpKa7yJA25g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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