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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c69cd385b160330df295a040160c9e99f465fd87d61e441805d29e518b9ea3e' 
  AND token = 'C93lv2EX2wk9cbU4xPEhC3Hoz9Xwi96W4ks+iBYADog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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