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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '348fadb235a6353b1f4f56426a8c7089b11aec77fbeea55865a4293d7f786b83' 
  AND token = '7JOasS91O7DtkWzCNdJo0wDVaKgkRlUO1G+6V9TUUzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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