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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d373a9b5c401057cfdec16ed6f01a1c0ec557cd84566d486649d820d765709' 
  AND token = '24fu3VkkoVoe90hqx3i2EBKdhGZ7YE8yNERbJj3og/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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