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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8aba683f77c5d30150959ac04c8ff518f95fc3b9ad2be74238333eafbf37c40' 
  AND token = 'x5fc3FMA2XATITF8cEp2Uk3x7P17tBEx/uCbkATRU0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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