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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a3f71dae8d5c3c96511a0d5c3ed12269e47c33cfb7165470cc52b4303826eb' 
  AND token = 'MilmLUUMV+kJ/fLDPI2f0p0sghsM32koYoK4nkDTsks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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