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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8694e1c573492093396f8bda541f9f916a045242dac6a91250ce99129ddacbb' 
  AND token = '+kTqqmHJEF+xPaS+XWt/vKxD/ZEbq8TMT6q0m18bybc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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