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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5408144671e4f8a72f0f030a615dbb67d135475503d7796e86e1c72f3c47080a' 
  AND token = 'KwSYcPrIwq1Iun+V7T25jDOtb12QA7n+Jq5KvaJp/ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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