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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c622dab7adc663122a9c9746fc19c46c02f34714fa6ee19af6a9f2d1c039efa0' 
  AND token = '6FjJ90eeARMwrInJ9/CIJ5Q7oeDzpigyN/qhV7bIPJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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