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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ed3155ae210982980353cbca51c8e96c82aec5e11568347ea68a7c1acdf278' 
  AND token = 'ThDGFqD/bqe/3l/72rwDaAGlKDjab+ts7b1M3ahAuiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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