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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5006c69b6ed799f148544adb2b9542ec97be23f336dd66a77a2b0219f2f70b3d' 
  AND token = 'hW/Dv5jhJIHmluk7BDA30eFc5Xiun4P6tMbMjenJCO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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