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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660f57f67f2d1dfb7ad2447e353498a935bf50566ea0a41b88dba0f0f65497ad' 
  AND token = 'ZHRJto7mXWFKoXtB/fbcO2F5LSebkWSTlr816rZy8+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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