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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36af20b3d93e6fe4ac491567e3513b485c64d63d0abbe138177740c4c26ba92d' 
  AND token = 'pTO36Hq+zHLe4Q33Svf83btGc3VXpnEQdXtdZuiecLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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