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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767c9159e35abf1373b4a0e7f33bf2652977c2803fe15406e24e0b63a07818f0' 
  AND token = 'WLzHcTQSbcX4NmrSEEyx8rUq4G8GGi42z9y02jryyus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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