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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab7786cdac78a9e89155e0906308550c545d93401c3389f81336e34db1ec0b7' 
  AND token = '7xA0+xllfrLIgN4aJz9dUTlFeto1xLbU4W4Ap6vHVVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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