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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0a32f9ba1f589e8bc8e04c8e8417bf19045bf282616871852e399603aa349d' 
  AND token = 'TfPPqsYH4zPNPZQ9eaJW12mSLE7LM1HS9SOf61CEqV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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