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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa86cf153c0a9d284066d361fbadeffaad2b67e956d8d58d4c78d88d81ee076' 
  AND token = '/2A45ss1urfF7su4RiC1fGOtvojSzxk2XorFC+vUj8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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