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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f390e46a33550c74570eb5893197e4d7390c0bca1e04d5ab3bd91448f2d323' 
  AND token = '7FnWbMe22rxFvKgDx4CYsG6fDtfuQH72Ss2qaBwJ8mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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