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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1e3c8c3788f48cfa718ef186d28dfdd34b71618e4dd6fa54c9d620e83a97c1' 
  AND token = 'aVLHSz7ZUWzYoCajdDFybABZ2IB219x6xC1x+zhB5p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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