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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca999ff039f95f86933ff1b6cc408948313028f5e3adc4117c78def9611d423' 
  AND token = 'nWloO92NZgPfIgd3I9pFq8efmkWk19RiouKGzhUYKeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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