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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03559748e68e83bae2ba150605288a101ab83d1df998223ea8d9b0254876df9' 
  AND token = '8EkB0lIfQLjNIUv2ouywRb6v4NSnGVV37gpEWeSaQzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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